Continuous zooming infrared lens

Abstract

The invention relates to a continuous zooming infrared lens, and the lens can improve the imaging quality. The lens comprises a first lens group serving as a front fixed group; a second lens group serving as a zooming group; a third lens group serving as a compensation group; a fourth lens group serving as a rear fixed group; a fifth lens group serving as a focusing group which is used for compensating the offset of an image plane under the condition of different object distances and different temperatures; and a zooming drive cam. The beneficial effects of the lens are that the lens remarkably prolongs the detection operation distance and improves the imaging quality, reduces the cost, and can achieve a good imaging effect. The zooming drive cam which employs the technology of curve fitting to design the curve of the zooming drive cam effectively solve a problem of the offset of the image plane in a zooming process.

Description

technical field [0001] The invention relates to infrared optical technology, in particular to a continuous zoom infrared lens. Background technique [0002] Infrared thermal imaging is a technology that is fully covered, works without light, can detect and identify targets at a long distance, and can detect target temperature. It is widely used in night vision, medical, military, security and other fields, and has broad application prospects and use value. In recent years, the application breadth and depth of infrared imaging technology have made great progress. [0003] When infrared products are used for target detection, the continuous zoom lens can be used to freely change the long and short focal lengths to achieve "wide range search and key monitoring". The structure of the existing focal lens is very complicated, requiring a lot of lenses, and the infrared zoom lens has no advantage in terms of cost due to the use of scarce germanium materials, and the use of too ma...

AI Technical Summary

Problems solved by technology

The structure of the existing focal lens is very complicated, requiring a lot of lenses, and the infrared zoom lens has no advantage in terms of cost due to the use of scarce germanium materials, and the use of too many lenses will reduce the lens transmittance and affect the detection Recognition rate

On the other hand, the design technology of the continuous zoom infrared lens in the prior art still uses the traditional method, using the Gaussian optical solution method to design the zoom cam curve. This method is effective in dealing with visible light products with a large F number. However, long-wave infrared products live in F1.0 or smaller F-numbers. The reason for aberration will cause the best image plane to deviate from the Gaussian image plane, resulting in image plane displacement and seriously reducing the imaging quality.

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